Apparatus for reducing stock to pulp.



C, W. SHARTLE.

APPARATUS FOR REDUCING STOCK TO PULP.

APPLICATION FILED APR.13.1914. 1,173,749. Patented Feb.29,1916.

2 SHEETSSHEET I.

noawtoz Charles mlsfilzarlle,

'UNYHEE%TATE% n s ri erained CHARLES "WELLS SHABTLE, 0E" TEIDDLE'LOWN, OHM).

A??? RATUS FGH, EEDUCITJG STOCK T0 PULP.

To all whom it may concern Be it known that T, Cnannns 3V. Srmnrnn, a citizen of the United States, residing at Middletown, in the county of Butler and State of ()hio, have invented certain new and useful Improvements in Apparatus for Reducing Stock to Pulp, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an apparatus for reducing stock to a pulp such as is commonly employed in the manufacture of paper and is a division of application, Ser. No. 783,267, filed by me November 25th, 1912.

The object of the invention is to provide means whereby coarse stock may be reduced to pulp of the desired degree of fineness by a continuous operation.

To this end it is a further object of the invention to provide means whereby the stock will first be broken up and reduced to pulp, the pulp removed, treated by means of heat to soften the same, theforeign matter removed from the pulp, the coarse stock separated from the fine pulp and again treated to further reduce the same, and this further reduced stock again treated to remove the pulp which has been reduced to the desired degree of fineness.

In the accompanying drawings, Figure 1 is a plan view of a pulp-reducing apparatus exemplifying an embodiment of my invention; Fig. 2 is a side elevation of the same, both of these figures being of a somewhat diagrammatic character; Fig. 3 is a vertical section through the outlet of a beatertub in the plane of line a of Fig. 1; and Fig. 4 is a vertical section of the whirl pool in the plane of line b of Fig. 1.

In these drawings I have illustrated one embodiment of my invention and have shown the same as comprising a complete apparatus from the breaker to the wet machine but it will be understood that parts and certain combination of parts of this mechanism are capable of use either with or without other parts thereof, and further that the particular embodiment of the invention here illustrated is chosen for the purpose of illustration only and that the construction of the various mechanisms may be modified without departing from the spirit of my invention.

In the particular embodiment of the invention here illustrated I have shown a Specification of Letters latent.

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7. Divided and. this application filed. atrn ,ses.

breaking engine 1, which may be of any suitable character but is here shown of a construction similar to the ordinary beating engine except that its cylinder is not set as close to the bed plate as in the case of a beating engine, the function of the breaking engine being to break up masses of coarse,

stock, such as books, bundles of paper and the like, and reduce the same to such a condition that it can be handled through pipes. The breaking engine is provided with a water supply pipe 2 and also has suitable means for removing therefrom the stock which has been properly reducec. In the present instance this is accomplished by causing the water in the tub to overflow and carry with it the pulp which is suspended therein. To this end I have shown the tub provided in one side with a low portion 3 which communicates with a suitable receiver or conduit arranged to receive the overflow from the breaking engine. The pulp is taken from the receiver 4 by means of a pump 5 "and delivered through a pipe 6 to a digester 6 where it is treated with heat. The digester may be of any suitable type but is here shown as a rotary digester to which steam is supplied by means of a pipe 6*. The pulp is discharged from the digester through a pipe 8 which delivers the same to the receiving end of a settling box which is here shown in the form of an elongated trough in which the pulp and water are maintained at such a depth as to permit the heavy foreign matterto settle to the bottom and thus be separated from the pulp which is carried on by the water and delivered to a screen 9 which may be of any suitable construction and is preferably provided with means for dragging the stock tailward along the screen plates.

I also provide means for separating the light foreign matter, such as bits of wood, cork or the like, which may be floating on the top of the stuff, as it passes from the settling box to the screen. To gccomplish this I have, in the present instance, provided the settling box, at one end, with an enlargement 10 having an inclined skimmer-board or fender 11 arranged across the upper surface of the enlargement and presenting its upper face toward the point of delivery of the pulp bv the settling box or trough 7. When the fluid mass is discharged into the enlargement 10 the current is reducedand the foreign matter more readily removed from the surface thereof. In the present instance I have shown the enlargement in the form of a circular vessel arranged at one end of the settling box and connected with the screen by means of a conduit or trough 12 which communicates with the vessel on that side of the fender opposite the inlet to the vessel from the settling box. The settling box discharges into the circular vessel 10 tangentially at a point above the bottom of the vessel so as to cause a circulation of the fluid mass of stufi in the vessel 10, thus constituting a whirl pool which facilitates the removal of the light foreign matter.

The screen 9 separates the fine pulp from the coarser mass which is carried along therewith and these coarse tailings are delivered to a reducing engine for further treatment. In the present instance this reducing engine is in the form of a beater of the usual type and the tailings are delivered thereto from the screen through a conduit 14. The beater is supplied with water through a pipe 15. After the pulp has been further treated and reduced to the desired degree of fineness it is removed from the engine and again passed over the screen. In the present arrangement of the mechanism the fine pulp is removed from the beating engine in the same manner that it was removed from the breaking engine, that is, by causing it to overflow from the tub of the beating engine. As here shown the overflow is' caused by providing the side wall of the engine with a low place, as at 16, which discharges into a receiver 17, from which the pulp is removed bv apump 18 and delivered through a. pipe 19 to the receiving end of the settling box 7 where it is carried along with the pulp coming from the digester through the settling box, whirl pool and over the screen. Thus a constant circulation is kept up and the stuff treated and retreated until itis reduced to a suitable fineness, which will permit it to pass through the screen. The pulp which passes through the screen is delivered to a wet machine 20. To this end a conduit 21 is arranged to receive the fine pulp and water which pass through the plates of the screen and convey them to the wet machine. The wet machine comprises a vat in which is mounted a foraminous cylinder 22 with which cooperate the usual couch-roll'QQ and doctor 23 for the couch-roll. The finished pulp is delivered to a vat 24which contains an agitator to keep the pulp in fair condition for outflow through a pipe 25, through which the finished pulp leaves the wet machine. 'A pump 26 takes the water and entrained pulp which has passed into the cylinder of the wet machine and delivers the same through a discharge pipe 27 to the settling box or trough 7, or elsewhere as may be desired.

The operation of the mechanism as a whole will be understood from the foregoing description. It will be noted that much paper making stock consists of Old papers and books and is generally in compact bundles, and with this will be mixed more or less hard foreign material, such as glass and iron, and also lighter materials, as wood, all of which should be kept out of the pulp that is delivered to the beating engine in which the pulp is finally reduced. Stock of thiskind having been placed in a breaking engine and supplied with large quantities of water will be broken up by the engine. The tub of the breaking engine is carried sufiiciently full of water to permit of overflow, which overflow carries the finer stock with it to the receiver 4. The unbroken masses do not overflow with the fine stufl but continue in circulationin the breaking engine. WVater and stock are added to the breaking engine as fast as required to make up for the overflow from thetub. The pump 5. delivers the broken stuff to the digester where it is treated with steam and the fibers thereof opened up and separated. Upon leaving the digester it goes to the settling box and passing through this box it deposits therein the heavy foreign matter which it contains, this foreign matter settling to the bottom of the box and the pulp and lighter material floating with the water. The stock entering the whirl pool circulates about the walls of the same and finds its way to the outlet of the screen. Any heavy matter which may have succeeded in passins. from the settling box to the whirl pool. will be deposited therein while the very light materials will be skimmed off by and retained on the fender 11. This results in the stock going to the screen practically free from both light and heavy impurities. The stock goes fr-(m the whirl pool to the screen and such portions thereof as .do not pass through the screen plates go from the tail of the screen to the beating engine where it is further reduced. The finer stock in the tub of the beating engine overflows and is pumped into the settling box on the way to the screen and thence delivered to the screen in the same manner as before. In this manner a continuous operation is kept up and any material which is ditlicult of reduction will be acted upon again and again by the beating en ine to reduce it to the desired degree of fineness. If it leaves the beating engine it will pass over the screen and be returned thereto until it has'been reduced to such an extent that it can pass through the screen. The pulp and water which passes through the screen plates finds its way to the vat of the wet machine where it is picked up by the foraminous cylinder, the water with some of the entrained pulp passing into the cylinder while the drier finished pulp is scraped off of the cylinder by the doctor and goes out through the pipe 25 to any point for use or for further treatment. The water and entrained pulp which have passed into the cylinder of the wet machine are taken by the pump 26 and again delivered into the general circuit so that the entrained pulp may be recovered. The water and entrained pulp handled by the pump 26 may be so dirty that it is undesirable to let it go back into the circuit to g9 into the finished pulp and in such case the pipe 27, instead of delivering into the circuit, may deliver to some point of waste or to some point of utilization of the material where dirtiness is not of special moment.

While I have shown and described one embodiment of my invention, it will be understcod that this has been chosen for the purposes of illustration only and that I do not desire to be limited to the details of construction, for obvious modifications will occur to a person skilled in the art.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. Pulp-reducing apparatus comprising a breaking engine, a beating engine, a screenadapted to deliver its tailings to the beating engine, a digester interposed between the breaking engine and the screen, means for transferring the finer material from the biaking engine through the digester to the screen, and means for transferring the finer material from the beating engine to the screen.

2. Pulp-reducing apparatus comprising a beating engine, a digester, a screen adapted to deliver its tailings to the beating engine, means for transferring material from the digester to the screen, and means for t'ansferring the finer material from the beating engine to the screen.

3. A pulp-reducing apparatus comprising a beating engine, a digester, a screen to deliver its tailings to the beating engine. a conduit to deliver to said screen, HIHHS for transferring the material from the digester to the conduit, and means for transferring material from the beating engine to the screen.

l. Pulp-reducing apparatus comprising a beating engine, a screen adapted to deliver its tailings to the beating engine, a settling box adapted to deliver to the head of the screen, a digester adapted to deliver to th settling box, and means for transferring t finer material from the the settling box.

5. Pulp-reducing apparatus comprising a beating engine, a screen adapted to deliver its tailings to the beating engine, a conduit adapted to deliver to the head or" the screen, means for transferring the finer material from the beating engine through said conduit to the head of the screen, and a tender disposed in said conduit and adapted to skim light impurities from the material on its way to the head of the screen.

6. A pulp-reducing apparatus comprising a beating engine, a screen adapted to deliver its tailings to the beating engine, a conduit beating engine to adapted to deliver to the screen and having an enlarged portion, means for transferring material from the beating engine through said conduit to the screen, and a fender arranged in the enlarged portion of said conduit to skim light impurities from the material passing through the same.

7. Pulp-reducing apparatus comprising a beating engine, a screen adapted to deliver its tailings to the beating engine, a wet machine adapted to abstract moisture from the screened fine material, a settling box adapted to deliver material to the head of the screen, a digester adapted to deliver material to the settling box, means for transferring the finer materialqfrom the beating engine to the settling box, and means for transferring to the settling box the water and entrained pulp abstracted from the screened material by the wet machine.

8. Pulp-reducing apparatus comprising a beating engine, a screen adapted to deliver its tailings to the beating engine, a wetmachine adapted to abstract moisture from the screened fine material, a settling box adapted to deliver material to the head of the screen, a digester adapted to deliver material to the settling box, means for transferring the liner material from the beating engine to the settling box, means for transferring to the settling box the water and entrained pulp abstracted from the screened materiai by the wet machine, and a. skimming device to engage the upper portion of the materiai flowing to the head of the screen.

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